changed varnishstat to be v4 compatible
v4 and v3  compatible client_req calculation
varnish-plus can replace varnish as requirement.

Follows from package renaming of Varnish Cache Plus.

The Provides: statement is not allowed to have a version
number in Debian, so this workaround will have to do.

Fixes: #114
Bump package number.
Merge branch 'master' into 3.0

Pull in support for running with Varnish Cache Plus from master branch.

Conflicts:
	debian/control